A businessman, his wife and 25-year-old son were shot dead last night outside their house by unidentified men in upscale Civil Lines area of Uttar Pradesh's Sitapur, about 90 km from the state capital Lucknow.60-year-old Sunil Jaiswal and his son Ritik had reached their house in Civil Lines at around 9:30 pm and it was when the son was parking his motorcycle that the four unidentified men shot the two at point blank range. Hearing gunshots, his wife rushed outside and she too was shot by the attackers. While Mr Jaiswal and his wife died on the spot, their son was rushed to a hospital in critical state where he died of his injuries.